CN105674638B - Gas-liquid separator, air-conditioning system and anti-compressor return the control method of liquid - Google Patents
Gas-liquid separator, air-conditioning system and anti-compressor return the control method of liquid Download PDFInfo
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- CN105674638B CN105674638B CN201610012174.9A CN201610012174A CN105674638B CN 105674638 B CN105674638 B CN 105674638B CN 201610012174 A CN201610012174 A CN 201610012174A CN 105674638 B CN105674638 B CN 105674638B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
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- Mechanical Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of gas-liquid separator, including：Ontology；Inlet tube and outlet, the nozzle of inlet tube and the nozzle of outlet are arranged at the top of ontology, so that gas-liquid mixture liquid after inlet tube enters gas-liquid separator is fallen in the bottom of ontology, air accumulation is inhaled into compressor at the top of ontology to pass through outlet；Pressure test device, pressure test device is for the pressure difference value between the bottom liquid pressure of detection body and the top gas pressure of ontology；Control module, control module calculate intrinsic liquid height according to pressure difference value, and judge whether liquid height reaches the first default liquid level to prevent compressor from returning liquid.The gas-liquid separator have detection and liquid level detection, and by simple, effective, economic mode come detect the liquid height in gas-liquid separator with prevent compressor return liquid.The invention also discloses the control methods that a kind of air-conditioning system and a kind of anti-compressor for air-conditioning system return liquid.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly to a kind of gas-liquid separator with detection and liquid level detection, one kind
Air-conditioning system and a kind of anti-compressor for air-conditioning system with the gas-liquid separator return the control method of liquid.
Background technology
In business air conditioner or domestic air conditioning, under refrigeration mode, the pressure high temperature hot gas that compressor comes out is changed by outdoor
Become high pressure Normal Atmospheric Temperature Liquid after hot device condensation, high pressure Normal Atmospheric Temperature Liquid becomes low-pressure low-temperature gas-liquid mixed after expansion valve throttles
Object, low-pressure low-temperature gas-liquid mixture become low-pressure low-temperature gas after absorbing heat by indoor heat exchanger, then pass through compressor again
Gas-liquid separator before import carries out gas-liquid separation, and the gas of final low-pressure low-temperature returns to compressor inlet.And in heating mode
Under, outdoor heat exchanger is evaporator, and indoor heat exchanger is condenser, makes whole path direction opposite by four-way valve ST commutations.
Wherein, when liquid coolant becomes gas after being evaporated in evaporator, due to considering the variation of load, it might have one
Partial refrigerant does not evaporate all, and can enter directly into compressor.Due to the Incoercibility of liquid, so not entering pressure
It before contracting machine, first has to carry out gas-liquid separation by gas-liquid separator, to ensure to enter all gas of compressor, ensures compression
Eupraxic operating.But since the pipe volume of interior machine is less than the pipe volume of outer machine, in refrigerating operaton in order to ensure
Refrigeration effect and the refrigerant that fills is too big for interior machine when heating as condenser, just have extra refrigerant quilt
It is stored in the gas-liquid separator of compressor inlet.Especially the liquid in the gas-liquid separator before defrost is started and enters in jelly machine
Position is all that comparison is high, and liquid, which enters the probability of compressor, at this time can become higher, so as to which compressor can be caused to return liquid, damage compression
Machine.And such case for multi-line system outer machine under, interior machine is more dangerous in upper installation situation.
And gas-liquid separator is substantially without the function of level sensing at present, and since the liquid level of gas-liquid separator exists at any time
Fluctuation, it is difficult to simply and effectively detect liquid level with conventional means.
Invention content
One of the technical issues of the present invention is directed at least solve to a certain extent in above-mentioned technology.For this purpose, the present invention
First purpose be to propose a kind of gas-liquid separator with detection and liquid level detection, by simple, effective, economic mode come
The liquid height in gas-liquid separator is detected to prevent compressor from returning liquid.
Second object of the present invention is to propose a kind of air-conditioning system.Third object of the present invention is to propose a kind of
The control method of liquid is returned for the anti-compressor of air-conditioning system.
In order to achieve the above objectives, a kind of gas-liquid separator that first aspect present invention embodiment proposes, including：Ontology；Into
The nozzle of mouth pipe and outlet, the nozzle of the inlet tube and the outlet is arranged at the top of the ontology, so that gas
Liquid mixture liquid after the inlet tube enters the gas-liquid separator is fallen in the bottom of the ontology, and air accumulation is in institute
The top of ontology is stated to be inhaled into compressor by the outlet；Pressure test device, the pressure test device are used to examine
Survey the pressure difference value between the bottom liquid pressure of the ontology and the top gas pressure of the ontology；Control module, it is described
Control module calculates the intrinsic liquid height according to the pressure difference value, and judges whether the liquid height reaches the
One default liquid level with prevent the compressor return liquid.
Gas-liquid separator according to embodiments of the present invention, by pressure test device come the bottom liquid pressure of detection body
Pressure difference value between the top gas pressure of ontology, control module are calculated according to the pressure difference value detected in real time in ontology
Liquid height, and pass through and judge whether liquid height reaches the first default liquid level to prevent compressor from returning liquid, ensure air-conditioning system
System safe and stable operation, and the level sensing mode for detecting liquid height in gas-liquid separator is simple, economical, effective, liquid level
Accuracy of detection is high.
According to one embodiment of present invention, the pressure test device includes first pressure sensor and second pressure passes
Sensor, for measuring the top gas pressure, the second pressure sensor is used to measure institute the first pressure sensor
Bottom liquid pressure is stated, the pressure test device is according to obtaining the top gas pressure and the bottom liquid pressure
Pressure difference value.
According to another embodiment of the invention, the pressure test device is differential manometer, and the differential manometer is for direct
Measure the pressure difference value between the bottom liquid pressure and the top gas pressure.
According to one embodiment of present invention, the control module calculates the liquid height according to the following formula：
H=(P2-P1)/(ρ * g),
Wherein, H is the liquid height, and P2 is the bottom liquid pressure, and P1 is the top gas pressure, and ρ is liquid
Volume density, g are acceleration of gravity.
In an embodiment of the present invention, the control module is additionally operable to carry out at mean value the liquid height calculated in real time
Reason.
In order to achieve the above objectives, a kind of air-conditioning system that second aspect of the present invention embodiment proposes, including above-mentioned gas
Liquid/gas separator.
Air-conditioning system according to embodiments of the present invention can real-time and accurately detect that the liquid in gas-liquid separator is high
Degree so as to prevent compressor from returning liquid risk by the judgement to liquid height, avoids compressor that liquid hit phenomenon occurs, ensures system
System safe and stable operation.
In order to achieve the above objectives, a kind of anti-compressor for air-conditioning system that third aspect present invention embodiment proposes returns
The control method of liquid, includes the following steps：S1, detect the bottom liquid pressure of gas-liquid separator in the air-conditioning system with it is described
Pressure difference value between the top gas pressure of gas-liquid separator；S2 calculates the gas-liquid separator according to the pressure difference value
Interior liquid height；S3, judges whether the liquid height reaches the first default liquid level；S4, if the liquid height reaches
The first default liquid level, then control the aperture of throttle in the air-conditioning system to become smaller, and improve in the air-conditioning system
The rotating speed of compressor, to prevent the compressor from returning liquid.
Anti- compressor for air-conditioning system according to embodiments of the present invention returns the control method of liquid, by detecting gas-liquid point
Bottom liquid pressure from device and the pressure difference value between the top gas pressure of gas-liquid separator are calculated in gas-liquid separator
Liquid height, then judge whether liquid height reaches the first default liquid level, and reach the first default liquid level in liquid height
When, the aperture of throttle is controlled to become smaller, and improve the rotating speed of compressor, to prevent compressor from returning liquid, so as to ensure air-conditioning system
System safe and stable operation, and the level sensing mode for detecting liquid height in gas-liquid separator is simple, economical, effective, liquid level
Accuracy of detection is high.
According to one embodiment of present invention, the outer wall of the gas-liquid separator is equipped with heating tape, wherein, when the liquid
When highly reaching the first default liquid level, the heating tape is also controlled to open the steaming to accelerate liquid in the gas-liquid separator
Send out speed.
According to one embodiment of present invention, after step s4, it further includes：Judge whether the liquid height is less than the
Two default liquid levels, wherein, the second default liquid level is less than the described first default liquid level；If the liquid height is less than described
Second default liquid level, then control the aperture of the throttle to become larger, and reduces described in rotating speed and the control of the compressor
Heating tape is closed.
In an embodiment of the present invention, the aperture variation speed of the rate of change of the liquid height and the throttle
Rate, the heating power rate of change correlation of the heating tape.
According to one embodiment of present invention, the top gas pressure and the second pressure are measured by first pressure sensor
Bottom liquid pressure described in force sensor measuring is to obtain the pressure difference value.
According to another embodiment of the invention, the bottom liquid pressure and the top are directly measured by differential manometer
Pressure difference value between gas pressure.
In an embodiment of the present invention, the liquid height is calculated according to the following formula：
H=(P2-P1)/(ρ * g),
Wherein, H is the liquid height, and P2 is the bottom liquid pressure, and P1 is the top gas pressure, and ρ is liquid
Volume density, g are acceleration of gravity.
Description of the drawings
Fig. 1 is the gas-liquid separator schematic diagram according to one embodiment of the invention；
Fig. 2 is the schematic diagram according to the gas-liquid separator of another embodiment of the present invention；
Fig. 3 is the structure diagram according to the air-conditioning system of one embodiment of the invention；
Fig. 4 is the structure diagram according to the air-conditioning system of another embodiment of the present invention；
Fig. 5 is the flow chart for the control method that liquid is returned according to the anti-compressor for air-conditioning system of the embodiment of the present invention；
And
Fig. 6 is the control for the control method that liquid is returned according to the anti-compressor for air-conditioning system of one embodiment of the invention
Schematic diagram.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawings come describe according to embodiments of the present invention propose gas-liquid separator, have the gas-liquid separator sky
Adjusting system and for air-conditioning system anti-compressor return liquid control method.
With reference to as depicted in figs. 1 and 2, the gas-liquid separator that the embodiment of the present invention proposes includes ontology 10,20 and of inlet tube
Outlet 30, pressure test device 40, control module (not shown).The nozzle of inlet tube 20 and the nozzle of outlet 30 are equal
The top of ontology 10 is arranged on, so that gas-liquid mixture liquid after inlet tube 20 enters gas-liquid separator is fallen in ontology 10
Bottom, air accumulation are inhaled into compressor at the top of ontology 10 to pass through outlet 30, wherein, inlet tube 20 is short tube, is gone out
Mouth pipe 30 is U-tube.
Pressure test device 40 is between the bottom liquid pressure of detection body 10 and the top gas pressure of ontology 10
Pressure difference value, control module calculates the liquid height in ontology 10 according to the pressure difference value, and judges the liquid height
Whether first default liquid level is reached to prevent the compressor from returning liquid.
According to one embodiment of present invention, as shown in Figure 1, pressure test device 40 includes first pressure sensor LP1
With second pressure sensor LP2, for measuring top gas pressure, second pressure sensor LP2 is used first pressure sensor LP1
In measuring bottom liquid pressure, pressure test device 40 obtains institute according to the top gas pressure and the bottom liquid pressure
State pressure difference value.In other words, when the liquid inside gas-liquid separator is more and more, by be arranged on bodies top first
Pressure sensor LP1 detects the gas pressure at the top of gas-liquid separator, and the second pressure by being arranged on body bottom portion passes
Sensor LP2 come detect liquid accumulation base pressure.
In this way, control module can calculate liquid level in gas-liquid separator using the relationship of static pressure measurement principle：P2=ρ * g*H
+ P1, ρ is the density of fluid to be measured refrigerant in formula, and g is local gravitational acceleration, and H is liquid height, and P2 is the bottom liquid
Pressure, P1 are the top gas pressure.That is, control module calculates the liquid height according to the following formula：H=
(P2-P1)/(ρ * g), wherein, H is the liquid height, and P2 is the bottom liquid pressure, and P1 is the top gas pressure,
ρ is fluid density, and g is acceleration of gravity.
According to another embodiment of the invention, as shown in Fig. 2, pressure test device 40 is differential manometer LP1-2, differential manometer
LP1-2 is used to directly measure the pressure difference value between the bottom liquid pressure and the top gas pressure.
Wherein, it in order to ensure the accuracy of detection liquid height, needs to monitor the bottom liquid pressure of gas-liquid separator in real time
Power and top gas pressure, control module are additionally operable to carry out average value processing to the liquid height calculated in real time, that is, are conversed
The liquid come accumulates height and carries out averagely value record in real time, and carries out the continuity processing of data, so as to according to treated
Liquid height is judged, to prevent compressor from returning liquid.
Gas-liquid separator according to embodiments of the present invention, by pressure test device come the bottom liquid pressure of detection body
Pressure difference value between the top gas pressure of ontology, control module are calculated according to the pressure difference value detected in real time in ontology
Liquid height, and pass through and judge whether liquid height reaches the first default liquid level to prevent compressor from returning liquid, ensure air-conditioning system
System safe and stable operation, and the level sensing mode for detecting liquid height in gas-liquid separator is simple, economical, effective, liquid level
Accuracy of detection is high.
With reference to shown in Fig. 3 and Fig. 4, the air-conditioning system of the embodiment of the present invention includes above-mentioned gas-liquid separator 1, and air-conditioning
System further includes compressor 2, four-way valve ST, outdoor heat exchanger 3, throttle 4, indoor heat exchanger 5.
Wherein, as shown in Figure 3 or Figure 4, the first port of four-way valve ST is connected with the exhaust outlet of compressor 2, and outdoor is changed
One end of hot device 3 is connected with the second port of four-way valve ST, one end of throttle 4 and the other end phase of outdoor heat exchanger 3
Connection, one end of indoor heat exchanger 5 are connected with the other end of throttle 4, the other end and the four-way valve ST of indoor heat exchanger 5
Third port be connected, the entrance of gas-liquid separator 1 is connected with the 4th port of four-way valve ST, and gas-liquid separator 1 goes out
Mouth is connected with the gas returning port of compressor 2.
In an embodiment of the present invention, air-conditioning system can be the commercializations such as domestic air conditioner or multi-line system
Air conditioner.
Air-conditioning system according to embodiments of the present invention can real-time and accurately detect that the liquid in gas-liquid separator is high
Degree so as to prevent compressor from returning liquid risk by the judgement to liquid height, avoids compressor that liquid hit phenomenon occurs, ensures system
System safe and stable operation.
Fig. 5 is the flow chart for the control method that liquid is returned according to the anti-compressor for air-conditioning system of the embodiment of the present invention,
Wherein, which can be air-conditioning system as shown in Figure 3 or Figure 4, including the above-mentioned gas with detection and liquid level detection
Liquid/gas separator.As shown in figure 5, the control method that the anti-compressor for being used for air-conditioning system returns liquid includes the following steps：
S1, detect air-conditioning system in gas-liquid separator bottom liquid pressure and gas-liquid separator top gas pressure it
Between pressure difference value.
Wherein, according to one embodiment of present invention, as shown in figure 3, described in being measured by first pressure sensor LP1
Top gas pressure and second pressure sensor LP2 measure the bottom liquid pressure to obtain the pressure difference value.
According to another embodiment of the invention, as shown in figure 4, the bottom can directly be measured by differential manometer LP1-2
Pressure difference value between fluid pressure and the top gas pressure.
S2 calculates the liquid height in gas-liquid separator according to pressure difference value.
Wherein, can the liquid height be calculated according to the following formula：H=(P2-P1)/(ρ * g), wherein, H is the liquid
Highly, P2 is the bottom liquid pressure, and P1 is the top gas pressure, and ρ is fluid density, and g is acceleration of gravity.
S3, judges whether liquid height reaches the first default liquid level.
S4 if liquid height reaches the first default liquid level, controls the aperture of throttle in air-conditioning system to become smaller, and
The rotating speed of compressor in air-conditioning system is improved, to prevent compressor from returning liquid.
That is, all it is that comparison is high in the liquid level that air-conditioning system is frozen machine starting and entered in the gas-liquid separator before defrost
, compressor is damaged to prevent compressor from returning liquid, is detecting that it is pre- that the liquid height H in gas-liquid separator is more than or equal to first
If when the A% ratios of liquid level such as gas-liquid separator height G, immediately turn down the switch of throttle in system, such as
Throttle is simple expansion valve in Fig. 3 and Fig. 3, at this moment needs to reduce the aperture of expansion valve, and in large-size air conditioning system
Throttle is likely to be the combination of solenoid valve and expansion valve, at this moment just needs that solenoid valve is controlled to close and/or turn down expansion valve
Aperture, while improve the rotating speed of compressor such as compressor raising frequency and control.The refrigerant stream of the inlet tube of gas-liquid separator at this time
Amount is gradually reduced, while the air outlet pipe of gas-liquid separator is reduced rapidly due to pressure, accelerates the sudden strain of a muscle of refrigerant in gas-liquid separator
Speed is steamed, the refrigerant in gas-liquid separator gradually decreases, so as to effectively prevent the generation that compressor returns liquid phenomenon.
According to one embodiment of present invention, the outer wall of gas-liquid separator is equipped with heating tape, wherein, when liquid height reaches
During the first default liquid level, also heating tape is controlled to open the evaporation rate to accelerate liquid in gas-liquid separator.In other words, such as Fig. 6 institutes
Show, when detecting that the liquid height H in gas-liquid separator is more than the A% ratios of gas-liquid separator height G, can assist
Heating tape is opened, accelerates the evaporation rate of liquid in gas-liquid separator.
Also, the liquid height H in gas-liquid separator can be monitored in real time due to air-conditioning system, when in gas-liquid separator
When liquid height H increases are very fast, the shutdown rate of throttle and the heating power of heating tape can all increase, so as to fulfill
Dynamic adjusts.In other words, the heating power change of the aperture rate of change of the rate of change of liquid height H and throttle, heating tape
Change rate correlation.
According to one embodiment of present invention, as shown in fig. 6, after step s4, above-mentioned prevents for air-conditioning system
The control method that compressor returns liquid further includes：Judge whether liquid height is less than the second default liquid level such as gas-liquid separator height
The B% of G, wherein, the second default liquid level is less than the described first default liquid level；If the liquid height is less than described second
Default liquid level, then control the aperture of the throttle to become larger, and reduces the rotating speed of the compressor and the control heating
Band is closed.That is, when detecting B% ratios of the liquid height H in gas-liquid separator less than gas-liquid separator height G
(wherein A>B, have return difference with prevent valve be frequently opened and closed or the frequent power on/off in heating tape) when, heating tape can be closed, and
Gradually open the aperture of big throttle.
In conclusion the control method that the anti-compressor for air-conditioning system of the embodiment of the present invention returns liquid may be used most
Effectively economic mode combines the dynamic monitoring of liquid level to detect whether the liquid level in gas-liquid separator reaches dangerous liquid level
System drain controls to prevent compressor from returning liquid, ensures the safe and stable operation of air-conditioning system.
Anti- compressor for air-conditioning system according to embodiments of the present invention returns the control method of liquid, by detecting gas-liquid point
Bottom liquid pressure from device and the pressure difference value between the top gas pressure of gas-liquid separator are calculated in gas-liquid separator
Liquid height, then judge whether liquid height reaches the first default liquid level, and reach the first default liquid level in liquid height
When, the aperture of throttle is controlled to become smaller, and improve the rotating speed of compressor, to prevent compressor from returning liquid, so as to ensure air-conditioning system
System safe and stable operation, and the level sensing mode for detecting liquid height in gas-liquid separator is simple, economical, effective, liquid level
Accuracy of detection is high.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be based on orientation shown in the drawings or
Position relationship is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, " multiple " are meant that at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
It connects or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature right over second feature or oblique upper or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " example ", " is specifically shown " some embodiments "
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It is combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the different embodiments or examples described in this specification and the feature of different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (11)
1. a kind of gas-liquid separator, which is characterized in that including：
Ontology；
The nozzle of inlet tube and outlet, the nozzle of the inlet tube and the outlet is arranged at the top of the ontology,
So that gas-liquid mixture liquid after the inlet tube enters the gas-liquid separator is fallen in the bottom of the ontology, gas gathers
Collection is inhaled into compressor at the top of the ontology to pass through the outlet；
Pressure test device, the pressure test device are used to detect top of the bottom liquid pressure with the ontology of the ontology
Pressure difference value between portion's gas pressure；
Control module, the control module calculate the intrinsic liquid height, and described in judgement according to the pressure difference value
Whether liquid height reaches the first default liquid level and controls air-conditioning when the liquid height reaches the first default liquid level
The aperture of throttle becomes smaller in system, and improves the rotating speed of the compressor, to prevent the compressor from returning liquid；
Wherein, the outer wall of the gas-liquid separator is additionally provided with heating tape, when the liquid height reaches the described first default liquid level
When, the control module also controls the heating tape to open the evaporation rate to accelerate liquid in the gas-liquid separator；
Also, the heating of the rate of change of the liquid height and the aperture rate of change, the heating tape of the throttle
Rate of power change correlation.
2. gas-liquid separator according to claim 1, which is characterized in that the pressure test device is passed including first pressure
Sensor and second pressure sensor, the first pressure sensor are used to measure the top gas pressure, the second pressure
Sensor is for measuring the bottom liquid pressure, and the pressure test device is according to the top gas pressure and the bottom
Fluid pressure obtains the pressure difference value.
3. gas-liquid separator according to claim 1, which is characterized in that the pressure test device is differential manometer, described
Differential manometer is used to directly measure the pressure difference value between the bottom liquid pressure and the top gas pressure.
4. gas-liquid separator according to any one of claim 1-3, which is characterized in that the control module is according to following
Formula calculates the liquid height：
H=(P2-P1)/(ρ * g),
Wherein, H is the liquid height, and P2 is the bottom liquid pressure, and P1 is the top gas pressure, and ρ is close for liquid
Degree, g is acceleration of gravity.
5. gas-liquid separator according to claim 1, which is characterized in that the control module is additionally operable to calculating in real time
Liquid height carries out average value processing.
6. a kind of air-conditioning system, which is characterized in that including gas-liquid separator according to any one of claims 1-5.
7. a kind of anti-compressor for air-conditioning system returns the control method of liquid, which is characterized in that includes the following steps：
S1 detects the bottom liquid pressure of gas-liquid separator in the air-conditioning system and the top gas pressure of the gas-liquid separator
Pressure difference value between power；
S2 calculates the liquid height in the gas-liquid separator according to the pressure difference value；
S3, judges whether the liquid height reaches the first default liquid level；
S4 if the liquid height reaches the described first default liquid level, controls opening for throttle in the air-conditioning system
Degree becomes smaller, and improves the rotating speed of compressor in the air-conditioning system, to prevent the compressor from returning liquid；
Wherein, the outer wall of the gas-liquid separator is equipped with heating tape, when the liquid height reaches the first default liquid level,
The heating tape is also controlled to open the evaporation rate to accelerate liquid in the gas-liquid separator；
Also, the heating of the rate of change of the liquid height and the aperture rate of change, the heating tape of the throttle
Rate of power change correlation.
8. control method according to claim 7, which is characterized in that after step s4, further include：
Judge whether the liquid height is less than the second default liquid level, wherein, it is pre- that the second default liquid level is less than described first
If liquid level；
If the liquid height is less than the described second default liquid level, the aperture of the throttle is controlled to become larger, and reduce
The rotating speed of the compressor and the control heating tape are closed.
9. control method according to claim 7 or 8, which is characterized in that the top is measured by first pressure sensor
Bottom liquid pressure described in portion's gas pressure and second pressure sensor measurement is to obtain the pressure difference value.
10. control method according to claim 7 or 8, which is characterized in that the bottom liquid is directly measured by differential manometer
Pressure difference value between body pressure and the top gas pressure.
11. control method according to claim 7, which is characterized in that the liquid height is calculated according to the following formula：
H=(P2-P1)/(ρ * g),
Wherein, H is the liquid height, and P2 is the bottom liquid pressure, and P1 is the top gas pressure, and ρ is close for liquid
Degree, g is acceleration of gravity.
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